CVE-2025-21841: cpufreq/amd-pstate: Fix cpufreq_policy ref counting

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-03-07 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: cpufreq/amd-pstate: Fix cpufreq_policy ref counting amd_pstate_update_limits() takes a cpufreq_policy reference but doesn't decrement the refcount in one of the exit paths, fix that.

Affected products

Linux kernel: from 6.12 before 6.12.16; from 6.13 before 6.13.4; 6.14-rc1 — fixed in 6.12.16, 6.13.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.16, 6.13.4. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/28e4c515cf644c621800bd97841757fd49891ba4
https://git.kernel.org/stable/c/3ace20038e19f23fe73259513f1f08d4bf1a3c83
https://git.kernel.org/stable/c/56e6976793c0fcf1638aa534242408ab4e4ca705

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